Andrew DB950 Instruções de instalação - Página 3

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Andrew Corporation

(Continued from page 2)

Locate the four mount-

ing brackets (two with

tabs and two without

tabs). Note the two

brackets with tabs

mate with the U-brack-

ets on the back of

the antenna (Figures 1

and 2).

Insert the 6" bolts into

the brackets with tabs

as shown in Figure 2.

Note: Once the clamp

is attached to the

antenna, there will not

be enough room

between the clamp

and the back of the

antenna to feed the 6"

bolt into the clamp.

Using the 1-1/2" bolts,

lock washers and nuts,

attach the assembled

bracket with tabs to the

antenna U-brackets

(Figure 2).

Note: One end of the antenna is labeled with an

"up" arrow. This end should point upward when the

antenna is mounted; this will allow the antenna's

drain hole to point downward.

Bring the antenna into position on the tower and se-

cure it using the brackets without tabs and hardware

provided as shown in Figures 2 and 3. To avoid twisting

the antenna, ensure that the top and bottom mounting

clamps are aligned with each other (Figure 4). Securely

tighten all hardware.

A check of the antenna VSWR as measured at the an-

tenna is recommended at this point. Note this measure-

ment carefully and record it for future reference.

After checking the VSWR, the station transmission line

(not supplied) should be connected to the antenna us-

ing a male N-type connector or a 7-16 DIN connector,

depending upon the antenna model. Make the connec-

tion snug, but do not apply heavy force with pliers.

10. To avoid moisture problems, carefully wrap all connec-

tions with VAPOR-WRAP

DB11317), smoothing it into the cracks and over the

outer jacket of the transmission line. Failure to water-

proof the connection will result in improper operation of

your antenna.

11. Secure the transmission line to the tower in the best

Figure 3. Attaching Antenna to

a Mast Using DB390 Kit.

(part no. DB11316 or

Bulletin 095341-000 • Revision G • December 2003 • Page 3 of 4

Figure 4. Aligning Top and

Bottom Brackets.

MOUNTING

MULTIPLE ANTENNAS

Up to three antennas can be

mounted on a single mast;

however, several factors

must be considered to deter-

mine the proper mounting

method. When two or three

antennas are mounted on the

same mast, typical isolation is

45 dB or greater. The degree

of offset around the mast

combined with the diameter of

the mast must also be consid-

ered.

When two or three antennas

are mounted on a single mast, the mounting brackets will pre-

Directional Panel Antennas

position to avoid physical

damage to the cable.

12.

After the antenna

and transmission line have

been installed, a careful vi-

sual check should be made

to ensure that:

•

All mechanical connec-

tions have been made and

the antenna is mounted with

sufficient physical clearance.

•

The "up" arrow is point-

ing upward and the drain

holes in the end cap are ori-

ented downward.

•

All connections have been

carefully wrapped to pre-

vent moisture problems.

Figure 5. Two antennas

"Stagger Mounted."